Theta Cygni (star)

Theta Cygni A
Spectral	F3 V
Type	Main Sequence
Multiple	Quaternary
Luminosity	4.265 LSol
Absolute magnitude	3.14
Mag Terra	4.48
Temperature	6745° K
Mass	1.38 MSol
Radius	1.49 RSol
Companion	Theta Cygni B

Theta Cygni B
Spectral	M3 V
Type	Main Sequence
Multiple	Companion
Luminosity	0.01 LSol
Absolute magnitude
Mag Terra	13.03
Temperature	3300° K
Mass	0.35 MSol
Radius	0.36 RSol

GJ 765B
Spectral	M? VI
Type	Subdwarf
Multiple	Companion
Luminosity	LSol
Absolute magnitude
Mag Terra	13.0
Temperature	° K

GSC 03564-00642
Spectral	M? V
Type	Main Sequence
Multiple	Companion
Luminosity	0.013 LSol
Absolute magnitude
Mag Terra	13.0
Temperature	3700° K
Radius	0.28 RSol

The star Theta Cygni is a quaternary star system composed of a white main sequence star of spectral classification F3 orbited by 3 dim, pinkish-white M-class companions.

Description (Specifications)

The Theta Cygni system contains two primary components (Theta Cygni A and Theta Cygni B) associated with two additional M-type stars, GJ 765B and GSC 03564-00642.

• Theta Cygni B, orbits Theta Cygni A at a distance of approximately 46AU.
• Two stars known as Theta Cygni C and Theta Cygni D are mere optical companions of Theta Cygni from the perspective of Terran-sky observers, and are actually not otherwise related to the Theta Cygni system.
• Theta Cygni A is orbited by at least one Jovian-type planet, Theta Cygni b.

• Theta Cygni planetary system:

COMPANION: Theta Cygni b MASS:~ 2.29 M_J ORBIT: ~ 0.63 AU PERIOD: 154.5 days

The Theta Cygni star system lies approximately 18.3 pc from Terra, and is located in a Corespinward/Spinward direction from Terra at bearing 082.7^o Galactic Longitude and +13.8^o North Galactic Latitude.

History & Background (Dossier)

Despite the similarity in name, Theta Cygni A is NOT the primary star of the world Theetasigni/Pact (Dagudashaag 2226). Though it lies at the correct bearing from Terra and has the correct spectral type, Theta Cygni A is located much closer to Terra than the Theetasigni system.

Image Repository

TravellerMap (T5SS):
[1]

References & Contributors (Sources)

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This page uses content from Wikipedia. The original article was at Theta_Cygni. The list of authors can be seen in the page history. The text of Wikipedia is available under the Commons Attribution-ShareAlike 3.0 Unported License.

This list of sources was used by the Traveller Wiki Editorial Team and individual contributors to compose this article. Copyrighted material is used under license from Mongoose Publishing or by permission of the author. The page history lists all of the contributions.

• EXTERNAL LINK: SIMBAD @ University of Strasbourg: [2]
• Author & Contributor: WHULorigan